The life cycle of Pachyleuctra benlocchi (Navas) takes four years in a mountain stream at an altitude of 1 930 m in the central Pyrenees. The stream is covered with snow for four to five months in a year and water temperature ranges from 0 °C in winter to 17 °C in summer. Larvae hatch in autumn and the adults emerge four years later, the emergence period starting at the time when the snow melts.

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